基于SWMM的某市政道路降雨径流和水质分析  

Rainfall runoff and water quality analysis of a municipal road based on SWMM

作　　者：陈曦 熊鸿斌[1] 杜浩强[2] 谢进 刘娜 CHEN Xi;XIONG Hongbin;DU Haoqiang;XIE Jin;LIU Na(School of Resources and Environmental Engineering,Hefei University of Technology,Hefei 230009,China;Hefei University of Technology Design Institute(Group)Co.,Ltd.,Hefei 230051,China)

机构地区：[1]合肥工业大学资源与环境工程学院,安徽合肥230009 [2]合肥工业大学设计院(集团)有限公司,安徽合肥230051

出　　处：《合肥工业大学学报（自然科学版）》2022年第7期967-973,共7页Journal of Hefei University of Technology：Natural Science

摘　　要：文章以陕西咸阳某市政道路为例,利用暴雨洪水管理模型(storm water management model,SWMM)对研究区域进行模拟,分析该道路区域与保持原状相比,采用下凹式绿地对降雨径流和径流污染物的削减效果。结果表明:设计降雨重现期分别为1/2、1、2、3、5 a时,布置下凹式绿地的土地利用情景能有效推迟地表径流形成时间、缩短径流时长、延缓峰值时间;随着降雨重现期增加,下凹式绿地对于地表径流总量和峰值流量的削减率逐渐减小,对于小强度的降雨事件,下凹式绿地能发挥较好的效果;布置下凹式绿地的土地利用模式对化学需氧量(chemical oxygen demand,COD)、悬浮物(suspended substance,SS)、NH_(3)-N、总磷(total phosphorus,TP)这4种污染物指标排放量的削减率先增加后逐渐趋于稳定状态,说明在降雨强度过大的条件下,削减效果将不明显。Taking a municipal road in Xianyang City,Shaanxi Province as an example,the study area was simulated by using storm water management model(SWMM),and the effect of reducing the rainfall runoff and runoff pollutants was analyzed by comparing the situation of the lower concave green space with the original condition.The results show that when the design reproduction period equals 1/2 a,1 a,2 a,3 a,5 a,respectively,the land use situation of the lower concave green space can effectively postpone the formation time of surface runoff,shorten the runoff time and postpone the peak time;with the increase of the rainfall recurrence period,the reduction rate of the total surface runoff and peak flow of the lower concave green space decreases,the lower concave green space can play a better role in low-intensity rainfall events;the land use pattern of the lower concave green space is disposed to first increase and then stabilize the total amount of the four pollutant discharges of chemical oxygen demand(COD),suspended substance(SS),NH_(3)-N and total phosphorus(TP),which shows that under the condition of excessive rainfall intensity,the reduction effect will not be obvious.

关 键 词：下凹式绿地 降雨径流污染物 暴雨洪水管理模型(SWMM) 设计降雨强度 削减效果 

分 类 号：TU992.0[建筑科学—市政工程]